ICQ

Cross-platform file transfer program for Mac OS X...

Adium is a popular and, probably, the best instant messaging...

Syncman synchronizes your Mac's built-in Address Book with your Gmail...

iChat is an instant message client from Apple Inc. It supports various protocols...

JBuddy Messenger is a Java-based chat client. If you need to communicate with contacts on several public...

Jitsi (previously SIP Communicator) is an audio/video and chat communicator that supports protocols such as SIP, XMPP/Jabber...

Psi is an instant messaging client supporting the XMPP protocol, which makes it compatible with a large number of messaging...

iCamMaster is a internet application specialized in collecting, viewing...

Nimbuzz is everything you need to communicate for free. Here is what you get...

Mail.Ru Agent provides an ability to exchange instatnt messages between your friends...

Icy Juice is a Cocoa-based ICQ Internet chat client that support multiple accounts...

One of the internet's first instant messengers, that has evolved into a personal communications center...

Trillian is a chat application that tries to integrate most of the major chat networks...

qutIM is free and open-source multiprotocol (ICQ, Jabber, Mail.Ru, IRC, VKontakte) instant messenger...

Proteus...

Fire is a multi-protocol instant messenger client for Mac OS X...

Mobiola Headset allows recording of Skype and other calls and transforms your iPhone and iPod Touch into a PC...

Kopete is an instant messenger supporting AIM, ICQ, Windows Live Messenger...

JabberFoX is a Jabber client for Mac OS X and the name stands for "Jabber For OS X". Jabber is an open...

AirTalkr is an instant messenger program that can connect to MSN, Yahoo!, ICQ, GTalk...